Update README.md

Author: github-actions[bot]

README.md

@@ -333,19 +333,24 @@ Which is rendered as:
 <!-- OUTPUT:START -->
 <!-- ⚠️ This content is auto-generated by `markdown-code-runner`. -->
 ```bash
-usage: markdown-code-runner [-h] [-o OUTPUT] [-d] [-v] input
+usage: markdown-code-runner [-h] [-o OUTPUT] [-d] [-v]
+                            [--no-backtick-standardize]
+                            input
 
 Automatically update Markdown files with code block output.
 
 positional arguments:
-  input                Path to the input Markdown file.
+  input                 Path to the input Markdown file.
 
 options:
-  -h, --help           show this help message and exit
-  -o, --output OUTPUT  Path to the output Markdown file. (default: overwrite
-                       input file)
-  -d, --verbose        Enable debugging mode (default: False)
-  -v, --version        show program's version number and exit
+  -h, --help            show this help message and exit
+  -o, --output OUTPUT   Path to the output Markdown file. (default: overwrite
+                        input file)
+  -d, --verbose         Enable debugging mode (default: False)
+  -v, --version         show program's version number and exit
+  --no-backtick-standardize
+                        Disable backtick standardization (default: enabled for
+                        separate output files, disabled for in-place)
 ```
 
 <!-- OUTPUT:END -->